The present invention discloses a non-contact dynamic strain field measuring method and system for a rotating blade. The method includes the following steps: establishing a three-dimensional finite element model of a to-be-measured rotating blade, and extracting modal parameters of the three-dimensional finite element model; determining the number and axial mounting positions of blade tip timing sensors; constructing a conversion matrix of finite measuring point displacement and an overall strain field; and acquiring blade tip finite position displacement of the rotating blade based on the blade tip timing sensors, and acquiring, by a dynamic strain, dynamic strains of the rotating blade at any moment, on any position and in any direction based on modal processing of the conversion matrix.
Legal claims defining the scope of protection, as filed with the USPTO.
2. The method according to claim 1, wherein in the first step (S1), strains of each node of the finite element model of the rotating blade comprise six strain components in total, comprising three positive strains εx, εy, εz and three shearing strains γxy, γyz, γxz.
4. The measuring system for implementing the method according to claim 3, wherein in the first step (S1), strains of each node of the finite element model of the rotating blade comprise six strain components in total, comprising three positive strains εx, εy, εz and three shearing strains γxy, γyz, γxz.
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May 20, 2021
June 11, 2024
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